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After a run-in with The Brotherhood of Bullies, Bartman is entrusted with Professor Frink's newest invention, a cell phone that can give its owner superheroic abilities. In the hands of Bartman's sidekick, however, Houseboy (Milhouse) turns into a very, very, bad boy! Then while visiting Frink Labs, Bart uses the professor's newest invention to do the family laundry, and soon the genetic material from the clothing melds with Frink's concoction to create sentient metal creatures that resemble the Simpsons.